2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 489Get this manual
REAR DRIVING MECHANISM breather ho se upper mount ing nuts and bolts
l ow er the iack slightly and move it rearward to dis connect the propelle shaftRemove he fina drive assembly ou of the ve hicleRem ov the following: universal jo int O-rings (f ro he propeller shah and ou tp ut shaft of the engine)